Simplified Utf8Scalar and BinaryScalar

[jorgecarleitao]

Made both to use Option<String> and Option<Vec<u8>> respectively. One less unsafe ^_^

[codecov]

Codecov Report

Merging #660 (352b023) into main (a18555c) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #660      +/-   ##
==========================================
- Coverage   69.59%   69.56%   -0.04%     
==========================================
  Files         299      299              
  Lines       16746    16738       -8     
==========================================
- Hits        11655    11643      -12     
- Misses       5091     5095       +4     

Impacted Files	Coverage Δ
src/compute/comparison/mod.rs	23.07% <ø> (ø)
src/scalar/binary.rs	92.85% <100.00%> (-1.59%)	⬇️
src/scalar/utf8.rs	92.85% <100.00%> (-1.59%)	⬇️
src/buffer/bytes.rs	40.00% <0.00%> (-16.00%)	⬇️

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